Here is some information regarding what we know about the Blu-ray

1.) It will use 2.5 as a video source which is very similar to 2.1 which itself offers a slight improvement over 2.0 which is a huge improvement over 1.0. So if you have 1.0 or 2.0 then you are missing out and need to upgrade to 2.5 but if you already have 2.1 there might not be as much of a need to spend time downloading or waste a disc for 2.5 since 2.1 and 2.5 are so similar

2.) There will be 2 discs with Disc 1 featuring the film as well as menus for scene selections and audio and subtitles. There will be no special features beyond interactive menus on disc 1. Disc 2 special features will be Harmy's docs disc 2 will not feature any other types of special feeatures other than Harmy's docs